I have not heard of any unchippable xbox's ever. To my knowledge (and yours as it seems) they can all be chipped.
Since you bought it so recently it will most likely be a 1.6 or 1.6b xbox and those can be chipped too. They will need a LPC rebuild though, maybe your chipper can't handle that? Also the 1.6 xbox needs a special bios thats made for 1.6.
If you want to do the job yourself there are solderless solutions that are real easy and won't take long at all. Take a look at Xenium S.P.ICE and you will find it real easy. The first time ever I chipped a xbox was with the regular Xenium ICE and on a 1.4 and it took me total 1 hour to set iy up completely with EvoX and all stuff installed.
If you can get more info from your chipper about why it is "not chippable" I can check that info up to. Most likely it is bogus that it can not be chipped.
Any general info about the xbox (more than purchase date) will be help alot too.
If you have any more questions or wants to know something, feel free to ask.
