It's fine. Bolted in, in the trunk, and not a NOS bottle = Pass...
Doesn't mean it will stay there though. Be aware that some bolted in "speaker boxes" have been known to break loose under the cornering loads.
Small sheet metal screws into thin metal <> "bolted in" for heavy items like big magnet subs. Bolts have corresponding nuts and lock washers and such.
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I am a Commodore PET --- Now get off my lawn you kids...
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