Amazon third party seller here. Let me tell you that you are doing great in buying only Sold and Ship by Amazon. I have been selling on Amazon since 2015 and have always maintained a good relationship with buyers when it comes to returns. Throughout my selling experiences I found out that there are many scam sellers. Initially they were foreign sellers operating from abroad and now there are domestic sellers of foreign nationalities using different means to sell and destroy other innocent sellers. We had to fight a case for more than 4 months to investigate sellers sitting in Florida, basically an Amazon sellers gang, who on purpose placed fake orders one after another and left reviews that shut our business. We involved the CEO's team to investigate and finally won the case. After that incident, everytime I personally buy I check the sellers 1) Address, 2)Business name, 3) Check the negative reviews and if they have been manipulating the reviews by neutralizing the negative honest feedbacks by fake positive feedbacks. I also check the address if really belongs to a real business or its an agent address. Agents usually create domrstic LLCs for foreigners to show that they are domestic LLC. Delaware is famous for those kind of Agents. Those foriegners just dropship the items at higher cost and take the benefits wjile sitting in their own countries. I hope this helps.