Ok, you're running this once a month.
What is this worth to you to automate it?
For example, you could go into iNav. Sort the contents of the 'from'
directory by any choice of 'create date', 'change date', etc. Select the
dates you want, highlight those rows and move the suckers.
Or, you could read Scott Klement's IFS APIs and read the directory, save
the object, move the object, next.
Could even take it to an extreme and as part of the move, add it to a zip,
jar or some related file.