Is there any value in the boxes that are used to ship semen in? There is no equipment just Styrofoam.
I don't know whether to toss them or what???

If you stand a stud dog you KEEP them.
They are $30 or more a piece and are reusable.
If you do not stand a stud, someone you know who does may want them.
Most stud owners ask for the boxes to shipped back if they let you use theirs.

Alot of us keep them and next time send them to the stud owner, save that money and pay for the extender. I do keep them for my own stud dog also and try to keep extender on hand. They cost to much to toss. JMHO

I'm cleaning out my cabinet and have a few extra that I don't need, If anyone wants them shoot me an email and for the price of shipping you can have them.:)