Gino, for being a merchant member you sure don't know much about merchant law, the UCC or anything, do you?
Once you "sell" the sign and there is a balance due you are now a CREDITOR and creditors have rights under the law. One of them is repossession!!!
As a creditor, you have "security" interest in the property. You are in fact "loaning" money. I'll assume for the moment that all the proper boilerplate language is on the invoice, which was signed by the person ordering the merchandise, or was a seperate writing thereto.
The terms of the loan, a.k.a. 'credit', is governed by the laws of the specific state wher the transaction took place. Those laws are what determine a creditor's rights.
Here's a blurb from the Legal Services Network of Connecticut (legal aid)
What can creditors do to me if I do not pay my debts?
The actions that creditors can take depend on the kind of debt it is.
1 If you are behind in paying rent, your landlord can take legal
action to try to force you to move.
2 Utility companies can cut off service if you do not pay,
except during winter months (November 1 - May 1) if you
are a “hardship” case. (See the Legal Aid pamphlets, Rights
of Utility Customers and How to Keep Year ‘Round Utility
Service).
3 If you owe money on a “secured purchase” – something that
can be “repossessed” by the seller – you must pay on time to
avoid the risk of losing the purchase before you are finished
paying for it.
4 If you owe money on something that cannot be repossessed,
the creditor may take legal action against you to try to collect
the amount you owe. If he or she wins the case, you may be
ordered to pay a certain amount a week. If you do have to
defend yourself in court, you will probably need advice from
a lawyer.