You didn’t mention the marketplace this is selling on, so this will only pertain to eBay as that’s what I can only infer.
If you’re comfortable putting the capital toward it, I would just buy it and see what arrives. Record yourself opening the package in its entirety for record keeping just in case, and if the slab itself seems tampered with or something seems off, open a return request as the item doesn’t appear to be what was ordered. There are a myriad of possibilities right now; The seller doesn’t have experience selling graded cards, doesn’t know how to properly value, the card may have been stolen, they could be using a photo that doesn’t even pertain to the item they’re selling. All in all, eBay has the best buyer protection out there so there isn’t much risk purchasing an encapsulated collectible as any variance of what you receive versus what was listed makes it easy to get your money back.
If this is a private listing somewhere like on Facebook, just move on. Not worth the risk in my opinion