Hi Daniel...Welcome!!
Since you don't own these items, I'm assuming you can't get more pics? It would really be helpful to see the underneath and very close up (esp of the vase). I am no expert (not even a novice) but when I hear old and Asian my mind immediately goes to repro. Meaning prove it's not cuz I'm assuming guilt before innocence.
Second, what kind of auction is this. Ebay vrs a local auction house vrs Christies is a big deal IMO. In my very limited experience, a local auction house will do what they can to verify a 18/19th century claim, Christies would be more reliable and eBay well, buyer beware LOL!!
Any more info? Do these come with a verifiable provenance?