Check the seller's other items, I know alot of extreme couponers who make money selling HBA items on ebay that they get dirt cheap with coupons. I'm a couponer myself and I can tell you that I have gotten gillette & Shick razors and refill blades for free at the drug stores before when a deal lines up, at one time I had about 20 packs of the gillette mach3 disposables and I ended up selling them on ebay.
Usually if the seller is an extreme couponer you can tell by their other items or their history, see if they buy or sell coupons, also couponers tend to get alot of makeup, bodywash, nail polish and tooth whitening items on the cheap so see if the seller has a history of selling bundles of that stuff as well.
If it's a couponer selling the items they will be new in retail package and won't be loose blades, the loose blades is a dead giveaway that they are chinese ⊗⊗⊗⊗. Also if you see a really large package of blades they may be a bulk size that you can sometimes get at Sam's club, I have seen large packs of gillette blades there before and have seen them on ebay but again those won't be loose.
| 
