I've been retired for about nine months.
I brought back one small box of personal stuff from the office, which now sits somewhere in the basement, with the exception of a couple of useful items (e.g. daybook I contnued to use 'til year end, a conference laptop bag and a couple of vendor "swag" bags that I use for the beach or the gym). Unlike some others here, I have no significant work-related library, professional licensing, skills maintenance or on-going consulting issues. I am fully retired from that career and on with whatever new things life has to offer.
I've kept e-mail back-ups and contacts directory from work for the occasional continuity issue that comes up - e.g. forwarding service inquiries, etc. But these get fewer and farther between as time goes on. I had good relationships with those who might contact me, and have been glad to help put people together with the new folks where helpful.
I've been pleasantly surpised at how, pretty much from the get-go, I haven't felt any work-related identity hole to fill. I noticed recently, however, that when I meet new people and the "what do you do" question inevitably comes up, as rule I still mention that I retired earlier this year and the conversation often shifts to "from where and what did you do there", as if I still identify with that, which I guess I do more than I'd like to admit. So the work-related baggage I may still have around is more psychological than physical.
I guess I need to keep doing interesting things and eventually I'll start to answer that question differently (and in the present tense).