There can be a number of reasons the seller didn’t respond. Send them a second request and if they don’t answer, move on. Give the seller a few days to respond, not weeks.
Seller Silence
On two occasions during the past month I have posted a question to a seller about whether the item still has a manufacturers warranty. One selling an Aurender N20 and the other a JVC NZ700 projector. Neither has responded even though it has been a few weeks.
There should be a way to leave seller feedback before a sale to inform potential buyers of this issue.