That reminds me of some my best friend's relatives (yes, there's more than one or two persons who actually do that) who will bring tupperware to any family gathering, be it weddings, birthdays or funerals.
Oh, the two of them did that too.
They would show up at any family gathering and try to fill up their tupperware before people had a chance to eat. My mother-in-law handled it by waiting until they were greeting people and then she would take the paper sacks of tupperware and stash them away so that they couldn't find them.
And they had brought two grocery sacks full of tupperware to the church. They must have stuck it down in the church basement before they came through the receiving line. What is terribly ironic, is that both of them would consider themselves to be good, honest Catholics.
The reason it was only my spouse that was in the church kitchen in the basement of the church, was because we all tried to just leave one at a time so that there were always family there to greet the people. It was a small rural area, my father-in-law had lived their all his life and was the banker at the small local bank. We probably had almost a thousand people show up at the wake and another 300 for the funeral.
They did try at my Father-in-laws funeral luncheon, to have the church ladies bag up the extras. They were told no (traditionally all the extras are divided out and given to the immediate family after the luncheon) and they griped about that.
I heard that from a friend who was doing some of the serving during the funeral lunch. After all, they were FAMILY and so they should get the extras.
They are both gone now, but the stories linger on.