most the computers i use were reclaimed from the recycle bin or trash, or pieced-together from scrap parts. i can’t afford new stuff, although i did get a few hdd last year for media server. the last one i built with new parts was around 2007, using parts sourced from the insane deals common at that time (like $5 after rebate memory kits). that system cost less than $200 for everything, including a video card for the games i play. i still use that system every week.
if it’s just a bin, you’re gonna get all kinds of stuff regardless of what the sign on it says.
and also remember you need a way to send ‘up the chain’ or properly dispose of everything you don’t repurpose, recycle, or use yourself, including all the literal junk and potentially dangerous items like cathode ray tubes, spicy pillows and batteries of all sorts, and vape pens.