I don’t see why they shouldn’t become RG as long as their collection date and their location are being used for the observation. But it’s best to not put them on iNat at all, that’s not what iNaturalist is for. If they’re already there, don’t stress about it, but iNat isn’t a place for posting old specimens you didn’t collect.
This isn’t really what people should do. It happens, but iNat is not for any kind of biodiversity data. It’s for you to share the things you encountered and discuss them with other people.