The addresses, character for character
Everything the market is reachable at, in one place. Copy the address you want, keep this page open, and paste it into Tor Browser. If you are comparing an address you found somewhere else against these, the last six characters are where mismatches show up first.
What these strings are made of
Each address is 56 characters of lowercase base32 (letters a through z plus the digits 2 through 7) followed by .onion. No zeroes, no ones, no eights, no nines, no capitals, no dashes. If a “mirror” you found contains any of those, it is not an onion address at all.
All current Awazon mirrors carry the awazon prefix at the start. That is a vanity prefix the market paid to have, chosen so a buyer can recognize the address at a glance before opening it. A prefix is not proof of authenticity by itself. Someone can register a lookalike prefix too. Treat it as a first check, then do the full one on the address check page.
Do I need all three?
No. The three addresses are three doors into the same room. They show the same listings, the same vendors, and the same account, because there is one market behind them. Pick whichever you like. If one of them loads slowly or sits in the queue longer than you want, close the tab and try the next one. That is the whole reason three exist.
Why not open them through a clearnet proxy?
Services that promise “.onion access without Tor” (onion.to, tor2web, and a long list of “guest access” portals) work by loading the mirror on their server and streaming you the result. That server sees every page you open and everything you type, including your login. For a marketplace where the point is that a stranger does not sit between you and the page, that is a lot of trust to hand over for the convenience of skipping a download.
Install Tor Browser instead. Ten minutes, and the address bar ends in .onion and only you can see what you do there.