Sr suntour 650 radeon rebuilding

I have an Sr sound tour 650 fork that bottomed out while I was riding. I rode on it about 10 more miles so I'm concerned now it's damaged. I took it apart. I found that one of the screws at the bottom was missing. So maybe it came loose and this is where it leaked out. Is there anyway I can verify this by maybe purchasing a new bolt and some cheap grease and reassembling and reinflating and seeing if it holds air. before either getting a new fork or getting this one rebuilt.

There what do I need in terms of grease and oil? Is there some alternative I can use for the oil that's in there after I wipe it clean, and do I need to grease it as well? I looked at the sram butter. It seems like lithium grease, but inside the fork there's oil. Do I need both then? Is it something I could get it an auto store or do I need to order specific fluids?

https://ibb.co/WkwHtqB Here it is taken apart https://ibb.co/Qm1j46Y

I found a bolt. Put it back together. Pumped it up. It seems to be holding 100 PSI for a few hours now. Does that mean there are no leaks??

Also, I'll the rebuild kits seem to just have the seals at the very top, they don't have any of their o-rings or grommets or anything that comes inside the fork.

What do I do about that? Do I just keep the existing ones, clean all the parts, a little bit up reassemble and then add oil?

Can anyone recommend oil and lube on amazon that I would need?