User created with wrong case

My setup has always used all lower-case user names, in fact I think 
there was a mod for this years ago to force all names to lowercase at 
all times.  Recently one of my users informed me that he is no longer 
seeing anything listed in the overview screen (no spam, ham, viruses, or 
anything).  After much digging I discovered a new account had been 
created with the first letter capitalized.

Let's say the user's name is Robert... so his actual account name is 
'robert', which still exists in Maia, but a new account was created as 
Robert with the first letter capitalized.  Now if I look under the user 
screen there is no sign of Robert, only robert is shown, but if I do a 
search for *domain* I can then see both robert@ and Robert@, however 
Robert@ is showing thousands of spam and non-spam, while robert@ shows 
zeros in all columns.

So, since Robert doesn't show up in the list for me to link accounts 
together, how do I properly get the user's emails back into a place 
where he can see and sort through the spams?  And how do I ensure that 
future emails don't keep going to the name with the upper-case letter?

For reference, my server handles email from several different domains, 
and incoming email comes with a variety of upper and lower case 
permutations, but everything *should* be forced to lowercase for Maia.  
I've dug through, and cannot find any other accounts where an upper-case 
variation got through, so this is the only mailbox where it has 
happened.  Any help sorting this out would be appreciated.
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