Past-Tense of the Verb "CC"

I commonly use the verb "CC" (carbon copy). I know I could use the word "copy" instead, but I prefer to say "CC" (pronounced see-see). For example, I might say (and have told my co-workers):

I will CC you on that email.

But what's the past tense of the verb CC? Is it "CCed" (which seems strange)? I find that to be strange, so I usually apostrophe it to "CC'd" (which draws more attention to the strangeness).

And no, I don't want to say "copied."

Please provide proof in the form of a similar case with a different strange verb (eg. google => googled).

The OED gives the past tense of the verb cc (which it says is also spelled CC) as cc’d or cced. There are two citations for cc’d (1990, 2005) and one of cced (2000).

It also gives the past tense of OK as OK’ed, OK-ed, or OKed, but says nothing more about it.

CC'd or carbon copied should be fine. I don't find either strange.

For analogy, consider OK'd (also okayed).