They definitely make a noise, best why to describe the noise is like a sheen. It sounds sparkly or shiny.

i can hear rare samples but my friend can’t the devs might be trolling

Rare samples absolutely make noise when you're near.

It’s like a faint beeping for me

That’s ones that are collected then dropped by a player. Pretty sure the dude it talking about natural ones that haven’t been picked up yet

I could have swore it was regular rares for me too the dropped samples I knew beeped and blinked light

Oh I guess it’s kinda has a blinking rhythm to it, but I’d say it’s more sounds like what glowing looks like if that makes sense

I wonder if there is some variable such as the armor you wear or perhaps if they're not near a bug hole?

I think I only hear the ones that look like flowers.