Supposedly Confed decomissioned the Caernavarns and the 40-series CV's (Ranger class ships) after the war -- we don't know that anything else has been scrapped yet. The Manassas type light cruisers and the Tarawa type escort carriers are being sold off to the Landreich. They're still producing Concordias, circa mid-70s (and there are even still a few specialty Caernavarns in service).
The Excaliburs and the Thunderbolts in SO for the most part belong to various guard units -- the fighters were purchased when they were state of the art, as 'show' craft... like how the unit on Tamayo had state of the art T-Bolts in '69. T-Bolts and Excals are still mainstream fighters (the cheaper 'bolts moreso)... Midway herself has a Thunmderbolt squadron (which se see in SO).
Confed generally keeps their major warships closer to the homeworlds these days -- due to political pressure after the BAttle of Terra...