When I rented an apartment, we had the mezuzos we inherited from the previous tenant. We had them inspected and found they were kosher but not mehudar at all. The sofer said he’d say 2 of them were kosher b’dieved. We replaced all the mezuzos with mehudar ones.
Shortly after, we bought a house. We got lucky that while a Jewish tenant was taking over our apartment, the landlord wanted to do a lot of work there first, so we were told to take the mezuzos with us. We needed more than what we had in the apartment, so I called my uncle who is a sofer and asked him to get me some. He lives pretty far from me, but luckily, we moved in May, and a co-worker of mine was visiting his in-laws for Pesach, who live near my uncle. He brought them back for me.
It turned out we mis-counted the number we’d need, and were one short. I put up one of the old non-mehudar ones temporarily, and ordered one more mehudar one. When it came, I switched it. I gave the others to a Rav who told me he could use them to give to people sometimes when they needed them quickly.