Thought the following might be interesting.
I purchased my CS 2.4 speakers from Audio Consultants in April of 2011. They were a pre-owned pair (serial# 2951, 2952) and at time of purchase there were 5 years left on the transferable 10 year warranty.
Following are links to five Thiel CS 2.4 reviews (all rave reviews by the way) in more or less chronological order. Where discernable, I’ve listed the serial numbers related to each review.
Soundstage Nov 2003 – Marc Mickelson … Serial Number N/A
6 Moons Jan 2004 – John Potis … Serial Numbers 903, 904
Secrets of Home Theater and High Fidelity Jul 2004 – Jon E Johnson, Jr … Serial Numbers 413, 414
https://hometheaterhifi.com/volume_10_3/thiel-cs-24-speakers-7-2003.html
Stereophile Nov 2005 – Wes Phillips … Serial Numbers 1991, 1992
https://www.stereophile.com/floorloudspeakers/1105thiel/index.html
Audio Perfectionist Journal #13 2005 – Shane Buettner … Serial Number N/A
https://www.vandersteen.com/media/files/APJ%20Files/APJ13_Proof.pdf
(note that review begins on page 19)