I wouldn't worry too much about it.....he'll probably pass it with no problem, although it may take some time. Unless he stops pooping, starts passing blood in his stool, or starts acting like he's in pain, I wouldn't rush him off to the vets. There isn't actually anything they can do for him, other than take an X-ray to tell you where it is, or remove it surgically, which most vets won't do unless its a life threatening situation, which isn't very likely with something so small.
Try not to worry too much....... All three of mine have done it, in fact Mingie's done it twice (the little brat), and none of them are any worse for wear. It worried me far more than it bothered any ofthem! LOL They can be little buggers when they don't want something in their mouths, or when they're being little piggies about eating something!!
There are some things that you can do, however, to help them to pass it. First of all, stop feeding them anything that may be difficult to digest, such as Superworms or Crickets. You want to load them up with anything that has a lot of fiber in it, as that will surround the piece of plastic and make it easier for him to pass without doing any damage to his insides. Raw, grated Butternut Squash (or any other type of squash) is a good choice, and most of them like it. Another good choice is raw peeled apple, as that also has a lot of fiber in it, and it also has the added advantage of promoting frequent bowel movesments. You can also give him a few drops of Mineral Oil or Olive Oil every morning, which will help to slick things up in there and make it easier for him to pass. Give him frequent warm soaks for 20-30 minutes to promote frequent bowel movements, and keep him well
hydrated, and you can give him some very warm applesauce just before
bathing him.
Try not to worry too much....believe it or not, most things that they manage to put in one end usually do come out the other, given enough time!
This will probably bother you much more than its bothering him! LOL Also, give it some time to work through there. The fastest that any of mine passed something was 8 days, and the longest period of time was about three weeks. When he goes to the bathroom, use a couple of popsicle sticks to go through his poop, so you can tell when he passes it.
Just for future reference, I would stop using an eyedropper to feed him anything. The safest thing to do is to purchase plastic syringes (the type that allows you to put a needle on the end of it), and use a pair wire cutters to shorten the end of them before using them. Leave just enough of the end on them to allow you to work the syringe between his lips, but not enough that he can get his teeth into it. Then use a nail file or emery board to smooth off the sharp edges before using it. Syringes that I've modified like that are the only thing that I'll put in any of mine's mouths, and since I've been doing that, I've had no more problems with their swallowing things. There is no way that you can keep them from biting things that you need to put into their mouth, so you just have to learn to outsmart them!