According to the 4th Amendment a warrant is supposed to:
"...and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."
When they seize unrelated hardware they are clearly overstepping their bounds. I'd like to see the innocent parties take this to court and put a stop to this. We are far past the time when the FBI can claim ignorance as to how a colocation site operates.