Y'know what.... same thing happened to me yesterday. I thought it was because my GTA was patched which is why the cheats weren't being recognised, but then again.... my translated Jump Ultimate Stars had visible cheats....
Not uber-bothered about it, but it would be nice to know...
=)
I'd go with R4gift.
I got mine from them next day... went with 1st class recorded delivery and i got the tracking number for it too.
You also get a screen protector with it.... but for DS LITE!!! Hehe... still, better than nothing.