I bought some. It arrived in an unsealed open faced box. No plastic bag, no vacuum seal, no silica gel. No thank you.
BTW the spool is too large for the AMS and would need to be re-spooled.
I’ve bought it before. What I got was sealed. Amazon has a bad habit of reselling used items. It sounds like you might have got someone else’s return. I hope you complained to Amazon and got your money back. I get used stuff sold as new from Amazon all of the time. Their returns department is poorly trained.