Is the tenant obligated to compensate the owner of the stolen car, given the absence of a lease agreement, the negligence of the guard, the expiration of the car's license, and the difficult financial circumstances of the tenant?

The hand of the lessee over the leased car is a hand of trust (amanah), so he is not liable for it except in cases of transgression (ta'addi) or negligence (tafrit). Therefore, if the theft of the car was not due to the lessee's negligence in safeguarding it, he is not liable and is not obligated to pay its value to the owner.