I'm getting some in now.. Oil thickness will depend what it is cut with, sterilization is up to the source or who ever is packing it so it could or could not be sterile..
You can push it into oils. Or I know people who have stored up to ten weeks of loaded pins sitting needle up in T-shirt pockets but I personally would only preload 3-4 weeks worth as the oil could perish the rubber plunger a little.
Best bet get some empty v's ;)

Hey mate I have used them and they seem fine. They came straight through our customs here in (CENSORED) Have a crack that's the best was to see if they make it through. It also depends on who you are ordering them from. I have used Axio sachets.

I've ordered one time few years back just to check it out. Ordered some test-e. I did receive my order but it took over two months maybe it was the source idk..anyway theres no way to tell what it is no label or writing on them..It looked like a sample for shampoo or conditioner..it was def gtg though..bad thing is you have to pull it all out..so make sure you have a empty vial..but i think you can store them in pin for a week or two not 100% sure though.