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Was this for a residential rental?
Unfortunately, the time limit in Missouri is 30 days and the statute doesn't have any exceptions to allow you to stretch this time out. It doesn't mean you can't still sue for the additional amounts, it just means that you can't withhold the security deposit.
The statute can be seen at this link.
Please feel free to ask any follow up questions in this thread.
The info at the top states it is MO. Let me find the statute for you for Indiana.
The Indiana statute is at this link. It does allow 45 days to send the notice or return the money and the 45 days starts from the time the renter provides the new address in writing if that is any help.
There isn't a way to extend the time under the Indiana statute either, I'm not aware of any state that allows for an extension of the time, although you can seek the additional damages directly from the renter.
There is no case law on that issue yet. My suspicion is that a court is going to say that yes, it would count as written notice assuming you actually received it and read it and that it didn't go into a SPAM folder or something like that. If it went into a SPAM folder then there is an argument to be made that it isn't a written notice.