Craigslist concerns

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I'm selling some 60-66 panel doors on CL and had a bite but the persons responses have me concerned. He won't refer to the doors as such, only as "the item". Says he will arrange for a pickup as he is in N. Californua(209) area code. Has made up a couple stories about payment. First it was a certified check, now it's a regular check with an additional $25 for holding them. He also said he would come look at them but he isnt even here.
Has anyone here heard of this name:
Collins Beverly?
I am concerned and have notified CL and not giving up the doors until his check clears, if it does arrive. He said he works at a church, then whe he emailed again, he was in a "summit" somewhere.
Anyone else thinks this sounds strange or am I being over cautious?
Thanks