Crazyk
If it's specified in the contract get them to rip the plaster out.
Easy way to check if it's there is to take the PowerPoint off the wall and look in the cavity.
Easy way to check if it's there is to take the PowerPoint off the wall and look in the cavity.
Installed the wall speakers and checked the wall socket plate for speaker wires. Could see cotton like substance. Looks like it is installed.