Sending replacement parts to Back-Track is easy.  Simply ship the parts to Back-Track with the REF# (xxxx below) included on the shipping address that ALL shipments to Back-Track must have.
xxxx-(your company)
4725 N 5th St
Lincoln, NE 68504
USA
To inform us of the incoming parts.  Create a new ticket with the following subject line:   PARTS INBOUND - part name
If you need to send Back-Track new boxes.  We have 2 options.
Buy the boxes on Amazon and have them shipped directly to us same as above.
We have a large box manufacturer right next to Back-Track HUB1.  We can arrange a contact with their sales rep.