Others may have more or different answers to your questions Jenni but here's mine:
1. Do you or how do you check/test eggs before you eat them?
Just before you eat them you can place the eggs in water and discard any that float because they have gone bad. However, I generally don't "test" any egg before I eat them because just like a chicken egg from the supermarket it's unlikely to be bad if they are fresh.
2. How long can you keep them in the fridge before eating?
3 months or so - the worst that happens is they dry out... Actually, quail eggs left in the fridge for a week or two are much easier to peel after boiling than fresh eggs. Fresh quail eggs are murder to peel after boiling but they make great snacks or dinner party nibbles.
3. Can they get salmonella like chicken eggs?
Yes, but any food particularly meats or proteins can become contaminated with bacteria. You can sterilise eggs but then this introduces chemicals into the mix and the likelihood of getting sick from your own eggs is really low.
4. My eggs are currently small because females are just starting to produce. Can you eat them this small.
Yep, no problem.
5. How do you manage your eggs? Meaning do you date your containers of eggs per day or week (depending on number of birds of course)?
Collect them daily if you are eating or using them for breeding. Discard any cracked, dirty, or eggs exposed to moisture. For breeding I collect eggs over a seven day period and then incubate the batch because after 7-10 days fertile eggs start to lose their vitality. I never date my eggs but I do order them into what's new and older as they come in so we eat the older ones first.
6. If you miss collecting the eggs for a day or so does this mean you can't use the egg?
No not really. Realistically, you could leave the eggs for several days in the pen before collecting as long as they are in good condition and not exposed to the elements (direct sun or rain). Chickens can be a little different depending on if the eggs are fertile and you have a broody hen because if you leave fertile chicken eggs for several days and they are sat on by a hen they will start to grow but if the eggs are infertile then it doesn't matter if you don't collect them daily. Of course, the longer you leave an egg in the pen or nesting boxes the more chance it has of becoming dirty or broken.
7. Does anyone eat them raw?
You shouldn't no. Eating raw eggs either backyard or commercial can be risky due to bacteria. Cooking eggs kills bacteria.
Another question which I didn't ask the supplier. When I purchased the fertile eggs for incubation he scratched the surface of the eggs for........ anyone know the reason?
This is a complete guess - maybe to test their quality and find out if they are chalky? Eggs should be glossy and smooth but it's common to get chalky shells which could mean a lack of calcium. I've never heard of people scratching the shells before and I can't see why this is necessary but he obviously must have some reason...
Edit: I forgot to mention if you do have a collection of eggs that are no good for some reason or are just too old for your liking you can boil them up and feed them to a dog or crush them (shells and all) and feed them back to chickens or quail for extra protein and calcium.