No, he is not allowed to do that. During the first two years after purchase, the retailer has to look after your complaint even if the manufacturer has issued a warranty for the product. Within this 2-year period, you can demand exchange or repair from the retailer. If this does not work, you can reduce the price or cancel the purchase.

Quelle/Source: http://www.test.de/themen/steuern-recht/special/testde-klaert-auf-Populaere-Rechtsirrtuemer-1616227-1616229/

No. If the product has a defect, you can also complain without packaging. The receipt is important as proof with regard to where you have bought the defective product. If you have witnesses to confirm your purchase, you even to not need the receipt. The retailers can only insist on receipt and original packaging, if they take back or exchange faultless products on a good-will basis.

Quelle/Source: http://www.test.de/themen/steuern-recht/special/testde-klaert-auf-Populaere-Rechtsirrtuemer-1616227-1616229/

No. If the purchase has a defect, you can certainly exchange a price-reduced product on the basis of your statutory rights. With such a remark, the retailers refer to reduced products without defects: They will not exchange those on a good-will basis.

Quelle/Source: http://www.test.de/themen/steuern-recht/special/testde-klaert-auf-Populaere-Rechtsirrtuemer-1616227-1616229/

These are not flaws in the porcelain or glaze but perfectly normal signs of wear and tear. They usually appear eventually and result from cutlery abrasion. The cutlery abrasion traces can be easily removed with conventional non-abrasive cleaning fluids such as those used for the hob or with a special porcelain cleaner.

The fine, reticular lines or crazes are characteristc for the material ceramic and generally occur to ceramic articles with a so-called porous body, such as earthenware. Such crazes usually do not represent a quality defect. In order to get a smooth, impermeable and mechanically resistant surface, the articles are coated with a waterproof, glass hard glaze. As this glaze initially becomes viscous while being fired, every item would be inseparably baked to the ground with its base during firing. For this reason, the base - mostly at the bottom - cannot be glazed. The normal use of the tableware inevitably leads to water permeating the unglazed area. In case of great temperature variations, as they especially occur in the dishwasher, the absorbed water extends in the pores. The glaze cannot resist the arising tension and thus gets the typical crazes. However, these crazes cannot be permeated by any kind of liquid or substance. In case of external damage such as finest pinholes or cracks, an impermeable body, as of (fine) stoneware and porcelain, can also be permeated by water causing the body to expand under the glaze. In this case, crazes can also happen to a dense body.

Ceramic tableware with a so-called porous body can - under certain conditions - be infested by mildew. In order to get a smooth, impermeable and mechanically resistant surface, the articles are coated with a waterproof, glass hard glaze. As this glaze initially becomes viscous while being fired, every item would be inseparably baked to the ground with its base during firing. For this reason, the base - mostly at the bottom - cannot be glazed. The normal use of the tableware inevitably leads to water permeating the unglazed area. If a lot of water permeates and cannot evaporate under airy conditions, mildew can occur. Especially in the dishwasher, tableware is exposed to water for a long time so that the body can soak up a lot of it. Mildewing is additionally supported by plates and cups mostly being stacked in the cupboard with only the upper items coming to regular use, whereas those at the bottom often have to sustain the soaked moisture for a long time without being used.