“People are putting names on food in the company fridge” (joke)

A popular office joke printed on many e-cards is:
 
“Strange new trend at the office. People putting names on food in the company fridge. Today I had a tuna sandwich named Kevin.”
   
That is, the speaker had eaten someone else’s lunch. The joke has been cited in print since at least 2010.
 
       
JoyReactor
16:00:00; 30 Mar 2010
Strange new trend at the office. People putting names on food in the company fridge. Today had a / funny pictures
anon
 
Stray Laughs
Posted on November 29, 2011
Funny new trend at the office. People putting names on food in the company fridge. Today I had a tuna sandwich named Bob.
 
Twitter
ɐsǝяǝHƗ
‏@JustT0069
Funny new trend at the office. People putting names on food in the company fridge. Today I had a tuna sandwich named Bob…
10:16 AM - 29 Nov 2011
 
Google Books
5,000 Great One Liners
By Grant Tucker
London: The Robson Press
2012
Pg. ?:
Funny new trend at the office: people have started naming the food in the company fridge. Today I had a tuna sandwich named Bob.
 
Twitter
SteveShortBusKrause
‏@shortbuscomedy
Weird new trend at the office. People putting names on the food in the company fridge….Today, I had a tuna sandwich named Kevin!! - SS
4:29 PM - 4 Jan 2012
 
Twitter
Darrin B
‏@dbedalberta
Weird. People are naming their food in the fridge at work. Today I had a tuna sandwich named Jerry and a pudding cup named Sara.
8:57 PM - 14 Jul 2014
 
Twitter
Men’s Mind
‏@Mens_Mind_
Funny new trend at the office. People putting names on food in the company fridge. Today I had a tuna sandwich named Bob.
2:45 PM - 18 Sep 2014