Is there any market for the machine in its present condition?
johnboy
I also have the original box she arrived in and all her diskettes - OS Install / tidbits / printing / fonts / disk tools / quick time / utilities / system tools plus Word 5.1 plus Norton Utilities plus Compuserve Information Manager V2.3 plus fax modem plus some appletalk? leads / connectors. I suspect that some apparent duplicate diskettes were for a system update 3.
Mac in her “luggable” padded blue MacBag
I'd definitely say yes because of the above! As you probably know, most Macintosh SE boxes were thrown out over time, so the box is nice to keep (and better if in mint condition)

The MacBag is also nice for storage.
However, really, it's your choice, and I'd say you should keep your Macintosh SE because you may regret selling later.
Also, checking el-cheapo tool stands/flea markets/country fairs for a Torx T15 is a good idea too! One member got his for 50p at one of them.