Lumber payables do not fall under PACA.
PACA stands for United States Federal Perishable Agricultural Commodities Act. The purpose of this act is to “promote fair trade in the industry”. The Act is administered by United States Department of Agriculture (USDA) Agriculture Marketing Services (AMS).
The AMS assists with business matters dealing with the trade in fruits and vegetables. In particular helping with fair business activities and assisting in the resolution of disputes between firms in the industry. One area of responsibility is dealing with payables in bankruptcy processes – but not for lumber.