CL: do you follow up with your buyers?

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I sold an item on CL, buyer lived 1 mile from me, on my way to work, so I agreed to drop off the APC UPS to his place. his wife gave me the cash. That was on Monday.

Now I wonder if I should send follow up email to the guy, like "thank you for your business, hope you are satisfied with your purchase" or maybe I should not even bother?