Ditto.
What year and model is it also.

 

Both of my SSes (AA5 and Panel) came with rear speakers and sub.

 

So I guess you have the upgraded radio in them ?
Do you have the rear speaker by the lift gate ?

 

U1C Audio system, AM/FM stereo with CD player
U2K XM Satellite Radio
UE0 OnStar, delete
UE1 OnStar, 1-year of Safe and Sound plan
UQ3 Audio system feature, Pioneer premium 7-speaker system
US8 Audio system, AM/FM stereo with CD player and MP3 playback
US9 Audio system, AM/FM stereo with 6-disc in-dash CD changer and MP3 playback
UW5 Audio system feature, 6-speaker system
That rear speaker by the lift gate is the subwoofer


Came with the upgraded Pioneer seven speaker sound system with an amplifier RPO code UQ3

 

Here's the list for 2010, per the Sticky

U1C Radio - AM/FM Stereo, Seek/Scan, CD, Clock, ETR
U2J Digital Audio System S-Band "Not Installed"
U2K Digital Audio System - S-Band
UAF Display - Multiple Information Display (MID)
UD0 Sensor Indicator Inflatable Restraint, Frt RH/Child Presence Detector
UE0 Communication System - Vehicle, G.P.S. - Not Installed
UE1 Communication System - Vehicle, G.P.S. 1
UJ5 Accessory DVD Entertainment System - Headrest, Dual
UJM Tire Press Indicator Manual Learn
UK1 Frequencies - Japanese
UL2 Frequencies - European
UPF Wireless Interface - Short Range, Voice Recorder
UQ3 Speaker System - Enhanced Audio
US8 Radio - AM/FM Stereo, Seek/Scan, CD, Auto Tone, Clock, ETR, MP3, RDS
UUI Radio - AM/FM Stereo, Seek/Scan, CD, Auto Tone, Clock, ETR, MP3, RDS, USB Port
UVC Camera Rear View
UW5 Speaker System - 6, Base

 

S-band is XM/Sirius, GPS is OnStar

 

I was also thinking of that as well, and maybe a reason why they might be not desired.. Purchased as a Taxi? Medical Supply? Hearse? Lol

I do have the glove box tag here on the site when I had a question about Remote Start. I think it’s somewhere around there or in Key Fob zone lol.. but now I can’t find it?

 

2010 lt1

 

Planetrj. Here's your glove box sticker.
The UW5 code means it left the factory with the 6 speaker base system. Speaker in each door plus the 2 tweeters in the A pillars. A previous owner must have removed the rear door speakers if they're not there.

 

So there were have it, no such thing as a speaker delete. Go buy some speakers, they usually come with grilles.