Hi: A few general things you might consider.
1. I would make sure I trusted the presser.
2. Might look at
3. Insurance is important if you want to reduce the risk but truly understand what is needed (Pictures, proof of value, etc.) in the event you had to do a claim before you actually purchase.
4. Ensure the presser accepts responsibility in case books are lost, stolen, etc. while in their possession until CGC gets them.
5. Ensure Signature Confirmation but know there has been some changes due to Covid.