Maybe it's something like this...
I mean, where else would he put his spare paintings and bowties and extra hand? It only makes sense.
I repurposed a simple wood box found at Michael's, giving it an uneven Tardis blue staining.
Some of the items even come out and can be used to decorate your own tiny humble abode.
Don't forget your extra screwdrivers!
Even the Doctor has boxes of what seem like random junk. Good to know he's only huma....errr...right.
Also included: a spare spare key, emergency party bananas, a copy of Summer Falls and An Angel's Kiss, *gasp* TWO Weeping Angel children (how did they get there! Don't Blink!), River Song's party heels, a tropical umbrella (you never know when you're going to need festively bright umbrella), a portrait of River Song, Vincent's hat, the Doctor's fez, an extra Christmas tree decoration, an extra psychic paper book, a copy of the Don't Blink tapes on disc, oh, and a sword. Because the Doctor might need a sword someday...for some reason...
I hope you enjoyed this delightfully voyeuristic look into the depths of the Doctor's closet. One of them at least.