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I am going to try to best answer your question. I believe your strongest argument would be that he abandoned the property as he has not retrieved it since 1994. You are would be even stronger if you had reminded him that he needed to remove his items that he requested in the past and he failed to do so. I generally put in a timeframe for removal of items in my agreements in order to avoid this exact problem.
I hope this is helpful and I wish you the best of luck.