Nope... but did check in the prod settings for the "local" config while working on a production bug close to the end of my contract. A couple weeks later another dev had dropped a production table as he'd used the local/dev connection string. Fortunately, every service request was logged and re-playable... so the DB was restored from backup, and every service request re-ran in order. Lost about a day of productivity for everyone using the app/service.

As to the config, this at least was pretty common for Web.*.config files in the .Net space in the mid 00s. I was never a fan of it, and even with the newer options in the space, prefer simpler environment variables these days.