I didn't take "offence", I simply corrected your mistake.
I the given context, which is a possible timeline discrepancy (as per thread title), the "any" introduced by you solely to win an argument makes no sense.
But why don't you explain why the Nash couple showed any interest in the funeral home in the first place?
I made no mistake here.
Let's go back to what you wrote: "There's no way the FBI could have known in advance that the time card would not influence or even crack the case;
that's why evidence is collected even if it may initially seem insignificant and they evidently had every opportunity to secure this piece of evidence, yet failed to do so."
The clause in italics universalizes your assertion. Again, even if you didn't use the word "any," it's clearly implied in that clause. Any appeal to context on your part is nothing more than silly dodge. You've wasted enough of our time, so no more.