Buyer beware. Especially of sellers whose location is a generic UK, AUS or EU. Note, they always have that stock image of pretty things in a call center.
As for fake feedback, there are places online where, for a few Satoshis, you can buy a bot-built ebay/amazon storefront, complete with 1000+ rave reviews. The sales are 'real' via bot controlled customer accounts, often for auction items at a few cents. Then, either no goods are shipped or, random stuff is sent to real compromised customer accounts in a practice called 'brushing'*. Re-concatenate the following string: "Amazing seller. The best. Brilliant. A+++++"
@tom66 I've seen that seller you mention. Another seller, which I suspect is the same bot farm, is 're-listing' RS parts for... how much!? But they are Europe's leading parts supplier - from a bedroom in Dunstable.
@CJay I love those seller's who relist poundstore stock as if it's rare or hard to find. A 2SA transistor from 1972 is hard to find. As EEs we have genuine known sellers to buy those from.
* Brushing scam:
https://en.m.wikipedia.org/wiki/Brushing_(e-commerce)