This buyer with the name of Sidney Stecher, is totally a crap and cheating buyer.
He will send you email saying about buying a lot of items, and after your quotation, will decide on 1 or 2 pcs for samples and ask for free. But after you ship them out, he will disappear and no response any more.
His information is as below:
Address: 341 South Cedar Crest Boulevard
Tel: (610) 435-7007
Yes, there are many buyers like this!!
The best way to avoid tampering, is that you impose upon the value of sample shipment by courier.