The space in the trunk is for the control module for soft close, so if no soft close installed, the space is free, the other spaces were considered for a gimmick which never made it to the E32. = doors softclose.
So you can use that space, no problem.
Is the sound coming from the trunk? Then maybe yor fuel pump makes the noise, or it is not fixed inside the tank and floats around. Remove the cover in the trunk and check the correct position of the fule tank pump.
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