There are many reports of Chinese N95 masks being imported into the US that do not filter 95% of particles (as is required to be a *N95* mask) or are otherwise defective.
There is also a lot of suppliers of medical suppliers who have popped up recently that have shown themselves to be unreliable, at best.
I would strongly recommend against buying from anyone selling masks, medical supplies, or anything coronavirus related on this forum.
They just gotta make that hustle man, unfortunately it is what it is. There have been several investigations into that n95 reliability and for a lot of chinese masks its complete BS and they just get a peice of fabric and plaster n95 onto it.