personally i've only heard of incidents actually. Let's see...one kid got i think 20-50 dollars stolen from his backpack...another got their iPod stolen from his...
you, i'm really halfway wanting to pity you and halfway wanting to scold you for your stupidity
The following is assuming you're in high school
1. I really don't know why you would bring both your GBA AND your DS, but in case you didn't know yet, that slot at the bottom of your DS is to insert your GB/GBC/GBA games on your DS.
2. I really don't know why you bring ALL your games either. Really, at most just bring one or 2 >>
3. I really don't know why you would bring games to school in general...Just because you're bored doesn't mean you can just whip out your GBA/DS in the middle of a speech and start playing. Lunch, maybe an exception, but still, unless you're getting a tiny lunch or not at all, most of that period would be spent eating, or talking with friends. As for the bus, it really shouldn't take that long anyways.
Either way if it's a team or class you should be able to track them down. Really if you asked your teacher about it, he/she'd probably go ask the class/team the next day. Now, i would go ask the teacher about it, but now that's it's been 2 weeks, he/she might not remember who took it, or really ask the class...i would take my chances, unless they're a real (insert swear word that would be used here). When the guy's iPod was stolen (above) the teacher made us stay in class until the guy who took it admitted it.
1st, it's school...KEEP IT IN YOUR BACK PACK
2nd, Never do it if your stuff's getting mixed with others
3rd, even so if it's not school, then it's probably a team thing, keep it in your bag
#2: Good steps to retrive your item
As for this excuse thing, in general it's kinda stupid to leave your hands in someone else's hands anyway. By your scenario, it seems more like you're trying to take the easy way out by relying on the school to do their work for you. Here's what i would do...
1. Ask around. there's probably someone who saw it, if not, then it's still one class/team, so you vaguely be able to pin out. Simply put, ask around, if they start getting emotional, that's probably the one you're looking for.
(Note: If the guy gives it back, then you can stop here)
2. You should be able to find out where he/she lives (You could Yahoo! it too).
3. Find him (rather specifically his/her parents).
4. Ask them if their child recently acquired a (Whatever it is).
5. Tell them that they stole it.
i'm sure that would get them into trouble, but sadly, that'd get you marked for life -_-.
Obviously there could be some problems with this, but that's my general pattern because i'm good at tracking people down, have a mini-delivery service so meh.
Kinda sorry bout this huge post, lately in speech we've been talking about sheer stupidity of some people, so if this really insults you...well, admittingly, it was half meant to, the post made it's point. I guess i'll leave you with good luck about finding your GBA, DS, and Games.