The rules regarding the 45 days for identification of future property and closing within 180 days still apply so as long as you close all the properties within that time you should be fine and pay no taxes for the 1031 exchange. 

I would do the following, at a minimum:-request that he complete your rental application (hopefully you have a thorough application),-request identification documents (government-issued),-require that he provide you with proof of his visa status and the authorized length of stay,-verify his employment, income, and financial stability, and-contact his previous landlords for references.If he cannot satisfy these application requirements, do not approve.

Please email me your valid ID card for identification before we proceed further.Awaiting your swift response immediately.Thank You.

Hey Joey, Here is my understanding of the subject:Key Components of a "Subject To" Offer:Clear Identification of Conditions: Clearly state the conditions ("subjects") that must be satisfied for the offer to be binding.

Verify your identityProof uses identification verification technology to ensure a secure transaction.

The time frames of 45 days for identification of replacement(s) and the 180 days to close are hard and fast.

From opportunity identification through to disposition. 

Once the identification period has ended, there's no going back to find another replacement property not already listed on the form and the result will be a failed exchange.

Also for bed bug prevention and identification.

I'd like to preface this with I'm not an expert but, you should be able to find a VIN  and contact the authorities to see if it may have been stolen/missing etc.