Yes. Metzee is not makers-only. Resellers, wholesalers, people clearing a shop, collectors trading up — all of it is ordinary and expected.
Nothing requires you to have made what you sell. Who can sell on Metzee
Including buying on Metzee to resell on Metzee
Also fine. If you spot something underpriced in somebody’s show, win it, and list it at what you think it is worth, that is a trade and not a trick. It is also how a lot of people learn what things actually fetch.
Two practical cautions rather than rules:
You pay the price you bid. A win is a promise to buy, and not paying for one costs you a strike rather than the item. What happens if I do not pay for something I won
You own the second sale. You are the seller now — your description, your postage, your returns policy, your defect rate if it goes wrong. The first seller’s standards do not transfer with the item.
The two things that are not allowed
Both are about your own store, and both are on the not-allowed list:
Bidding on your own items, or getting anybody else to. That is driving your own price up, and it is the one that gets accounts suspended rather than warned.
Buying from your own store to inflate your sales. A sale you made to yourself is not a sale, and it corrupts every number a buyer uses to judge you.
Neither of these is a grey area, and both are visible in the data.
What to tell buyers
You do not have to say where you got something. You do have to describe what it is.
The one thing not to do is imply you made it when you did not — a story that is not true is the fastest way to lose a buyer who finds out, and buyers of specific things do find out.
If you resell, say so. "I find these and bring them to you" is a proposition, and some buyers prefer it to a maker because your range is wider.
What actually decides whether it works
Not the sourcing. The description and the photographs, because you did not make the item and therefore know less about it than a maker does.
So: measure it, weigh it, photograph the flaws, and say what you do not know rather than guessing. "Unmarked, I cannot confirm the maker" is a better line than a confident claim that turns out wrong — the confident claim is what becomes a not-as-described return. How to write a condition description
And the tax side
The same as for anybody else: every seller needs a GSTIN or an ECO enrolment number. Buying to resell does not change that, and does not add anything to it. Do I need to charge GST on what I sell?
More: can I sell second-hand things, can I sell a replica, how to price an item.