us gold buyers Refusal to return items , Internet

I contacted us gold buyers around june 4th of this year through a web chat about whether or not they processed gold ore the person chatting with me said i should send a sample to see if there was usable goldthe very next day i sent a total of 3 samples to them by regular usps mail a Joseph Caba emailed me when i emailed them to ensure it's delivery he confirmed they did get it i was contacted again a few days later by a stanley Meirs here is his email
I have looked into your matter and here are our findings. Unfortunately, the material which you have provided is not
something we can process.  

We have few options of sending it back to you.  First is free via US Postal Service (fill out this Form and either scan/email it to us or fax to 212.764.7586). 

We can also send it via paid courier (you would need to let us know the amount of insurance to place on the parcel and you would have to pre-pay for shipping).  

Please let us know what path you would like us to take.  

Sincerely, 
Stanley J. Meirs 

I sent my reply but never saw my samples again and i have contacted them 5 times now no answer