You could try using the key for starters...
A torch
Go to the dealer with your ownership and have them make you a new key!
remove rear seat and insulation
To open the trunk on a Buick LaCrosse without a button on the door, you can use the key fob by pressing the trunk release button. If you don't have the fob, you can also access the trunk using the key itself, inserting it into the trunk lock. Alternatively, if the rear seats fold down, you can reach into the trunk from the cabin.
On the 1985 Caprice the logo emblem in the center of the trunk swivels up and out of the way revealing the keyhole.
cHECK THE FUSE IN THE FUSE PANEL.
NO, only button it has is on remote and manual open on trunk door, when car is unlocked.
On the 2011 Buick LaCrosse, the trunk release is located on the driver's side door panel. It is a button marked with a trunk icon. Additionally, you can also open the trunk using the key fob by pressing the trunk release button, or from inside the trunk itself for emergency access.
To trip the trunk on a 2004 Buick Rendezvous, locate the trunk release button on the driver's side door panel or use the key fob if equipped. You can also manually open the trunk by inserting the key into the trunk lock located on the rear of the vehicle. If the trunk is stuck or won't open, check for a malfunctioning latch or a dead battery in the key fob.
To open the trunk of a 1985 Jaguar, you typically use the trunk release lever located inside the vehicle, usually found on the driver's side near the door or on the dashboard. Alternatively, you can use the key to unlock the trunk directly. If the car is equipped with a remote key fob, you may also be able to open the trunk electronically. Always ensure the vehicle is unlocked before attempting to open the trunk.
To open the trunk of a Buick Rendezvous without the remote, locate the trunk release button inside the vehicle, typically found on the driver's side near the door or on the dashboard. You can also manually unlock the trunk using the key if your model has a keyhole on the trunk itself. If those options are unavailable, you can access the trunk through the rear seats by folding them down to reach the trunk latch directly.
press the door lock open or lock for 5 seconds.