My money would be on fake. Although no one can be sure unless you send one off to be tested.
WEDINOS in the UK will test for free and anonymously post the results online. And itll only take a few days.
So many people worldwide died from fake xanax recently, loads are full of fentanyl and/or super potent RC benzos. Be careful!
I too had fake white 2mg bars from the darknet, about 5 years ago - although the guy wasnt selling them as legit he was honest about what they were and had had 100 of them tested (he had thousands) and they DID only contain xanax, and averaged at 2.2mg instead of 2mg, some dosed as high as 2.5mg, i had 250 of them iirc (messy times lol). He'd posted a pic of the results on the listing along with a link too.
Came in a big vacuum bag, not strips.
This was before people started packing them with fent and RCs