Keep all eggs in the same position (don't turn them over). In your pic they look like good eggs, but personally I'd describe obvious slugs as feeling like a water
balloon, not good eggs...then again, I know the difference. Not all show veins right away...if possibly good, I incubate & check again later, it can take a while.
Slugs can look like slugs to start with, or they can appear to be good eggs that just eventually go bad. Was this snake bred? Good luck...and for sure, don't
bother a snake while she may be laying...be patient, probably lots more to go. They can get tired & rest a while between eggs...it's hard work!
BTW, the best way to see veins is in a dark room, with small flashlight up close. You said you can't put your hand in or she'll bite, so that tells me that you
haven't been close enough to candle & judge these as viable...
And even IF she has never mated, consider the possibility of parthenogenesis...the eggs still "could" be viable. I had an older un-bred rosy boa that had
some mid-life inspiration to reproduce...don't underestimate their urge to have young, whether eggs or live young it's always a remote possibility.