Can you be more specific? Using the CLI client is no different from the web interface.
The current caches are listed as:
$ travis cache -r PrincetonUniversity/PsyNeuLink --com
On branch devel:
cache-amd64-linux-bionic-0c8a3f94582812eaf6d61076bfea4d6b28d1481f68b81db45a8c99cf185ff020.tgz last modified: 2020-12-20 19:21:51 size: 12.61 MiB
cache-amd64-linux-bionic-83409cc664cc214a246b6b9dd67837d7c1a73bda551b21b7d2436ffd941bc6a7.tgz last modified: 2020-12-21 21:43:43 size: 12.33 MiB
cache-amd64-linux-bionic-9e25f6369047dc4cb79654e828882b687797f7ba16d4e6bb01bc7033b9cf942e.tgz last modified: 2020-12-21 21:48:43 size: 12.35 MiB
cache-arm64-linux-bionic-0c8a3f94582812eaf6d61076bfea4d6b28d1481f68b81db45a8c99cf185ff020.tgz last modified: 2020-12-20 20:00:23 size: 100.49 MiB
cache-arm64-linux-bionic-83409cc664cc214a246b6b9dd67837d7c1a73bda551b21b7d2436ffd941bc6a7.tgz last modified: 2020-12-20 19:16:05 size: 97.8 MiB
cache-arm64-linux-bionic-9e25f6369047dc4cb79654e828882b687797f7ba16d4e6bb01bc7033b9cf942e.tgz last modified: 2020-12-21 01:43:55 size: 97.89 MiB
On branch master:
cache-amd64-linux-bionic-0c8a3f94582812eaf6d61076bfea4d6b28d1481f68b81db45a8c99cf185ff020.tgz last modified: 2020-12-21 21:14:15 size: 12.6 MiB
cache-amd64-linux-bionic-83409cc664cc214a246b6b9dd67837d7c1a73bda551b21b7d2436ffd941bc6a7.tgz last modified: 2020-12-21 21:17:23 size: 12.33 MiB
cache-amd64-linux-bionic-9e25f6369047dc4cb79654e828882b687797f7ba16d4e6bb01bc7033b9cf942e.tgz last modified: 2020-12-21 21:19:33 size: 12.35 MiB
cache-arm64-linux-bionic-0c8a3f94582812eaf6d61076bfea4d6b28d1481f68b81db45a8c99cf185ff020.tgz last modified: 2020-12-21 21:06:37 size: 100.48 MiB
cache-arm64-linux-bionic-83409cc664cc214a246b6b9dd67837d7c1a73bda551b21b7d2436ffd941bc6a7.tgz last modified: 2020-12-21 21:11:42 size: 97.84 MiB
cache-arm64-linux-bionic-9e25f6369047dc4cb79654e828882b687797f7ba16d4e6bb01bc7033b9cf942e.tgz last modified: 2020-12-22 00:52:22 size: 97.91 MiB
Overall size of above caches: 0.65 GiB
Despite that the ppc64 builds are still downloading old caches from somewhere.