Hi Stephanie, congrats on finding some bottles! Vintage bottles are generally pretty safe, as long as they’re cleaned well – which you’re aware of. If you’re feeling uneasy about what may have been in the bottle before, best to keep those ones for topical preparations.
Lids can be tricky – some of Seraphina’s bottles had cork lids. You could see if corks fit in yours, however, keep in mind that anything without an air-tight seal won’t be ideal for oils or other substances that will oxidize. I’m going to do some poking around about lids for you and will respond with more information if I find any.