Hello, Sophy and welcome!
You can contact the TSA lost and found or the Denver airport lost and found to see if the laptop has been turned in. Here is the phone number: ***-***-****
You can also submit a claim if the item is not found, by going to this webpage, clicking 'File a claim' and filling in the information:
You can also call or email the Claims Department, here, if you need help filling out the claim form:
Email TSA Claims
I hope your friend is able to retrieve his laptop! Typically, only the owner of the item may claim it, if it is found; however, if he has left the country, you can have him write a letter, authorizing you to pick it up for him, under the circumstances, and have it notarized.
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