It could be somebody you 'urinated' off in the past but if it is they have to pay if their intent is to leave negs so if you don't hear from them within 4 days I would open the disputes and cross my fingers that they don't pay before I could close them.

If they do pay I would send the items as if they were just usual orders, seperately of course with full Paypal cover, and if they do open any dispute or leave negs you have compelling evidence of malicious buying.

If they are genuine, newbies then I would expect them to reply to your enquiry, unless of course they are numpties as well as newbies! Again just send if paid for and open disputes if not.