[mothered]

Gotcha, rather not get my acct flagged.  So use #2 for awhile then return for my refund or just return straight away?

SE the second Item within their return/refund policy, but to avoid raising suspicion, It's good practice to use a method that's different to the first- In this case, not the DNA twice In a row.

As said, It's not likely that the package will not reach Its destination twice In succession.

When is it safe to turn laptop #1 on?  Now or after I return #2 and get my money? Assuming I should be able to as #1 got lost and has nothing to do with me anymore...

Once your claim has been finalized (funds cleared Into your account, replacements Issued etc), do as you please with the laptop.