I have a modded original Xbox I am looking to get rid of, I have replaced the Microsoft Dashboard with EvoX although I can change it if you want additional changes are $10 flat + the cost of the Xbox (which is $275)...I CANNOT do case mods. but any software changes can be done...new dashboard, adding linux, and other things...the Xbox is in good condition, it has some scuff marks where it was scraped on a wall but everything works just as good as the day it was bought. let me know if there is any games you want and i can get them (new, retail games NOT backups)
I hope you realize that ISOs, New Dashboard, Linux, etc. is all free and can be done really fast. There's nothing to justify the $275 price when the xbox 360 is less and even to buy all the materials to flash one is less. Xbox 1's are sold for like $50 nowadays. And spend another $20 to mod it...Unless you did a massive hdd upgrade, there's nothing to back up your price man.
Just trying to make a point, don't take it personally.