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.
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.
press the door lock open or lock for 5 seconds.
Have you tried the trunk lock button inside of the glove box? Greg
Bottom half of instrument brightness control
try taking out the back seat. that is how i got into my 84 buick lesabra to unlock it