I will publish this weekend a formula for repossesion of Hametz in Hebrew. For now, it is
"Hareni mahzik/a mehadash hehametz
hahefker shehifkarti vebiarti bereshuti. Kol Hametz ve seor she
silakti yehe li lishtamesh bah velehenot bah kol yemot hashana."
"I hereby take possession anew of the ownersless hametz that I
abandoned and removed that is in my domain. All hametz and leaven
that I put away will be mine to use and enjoy all the days of the year."