Personally, I say leave them be. Check on them daily if you wish, but leave nature to do its thing. Human interference, even with a good heart, often times ends up hurting wildlife.
You have no clue what they are. Reason #2 to leave 'em be. Most herps
that I know of lay several eggs. More than 4 for sure.
Some bird eggs are pretty small. 4 seems about the right # for some birds. Some birds are migratory, and are protected until they fly home.
These are things I would make sure I knew before messing with any wild laid eggs of any sort. If you can't ID them, leave 'em be. That's just a good rule IMHO.
Ciao,
Rick