Wierd thing on 348 rear bumper

[MitchT]

Just doing a bit of window shopping and noticed a 348ts which has what appears to be a number plate screw cap on the rear bumper. A quick image search confirms that this is not normal. Why would someone have done this?

[S1owcoach]

Trickle charger outlet?

[sherman]

A plate for a rally or something?

[GR86]

Reversing camera now removed?

[595Heaven]

S1owcoach said:

Trickle charger outlet?

That would be my guess as well. Stupid to to place it in such a visible place...