Pam was brought in after things had been moved - she had not been in the house recently and I think expecting her to be able to tell them what was "out of place" was absurd.

The pineapple - - the large spoon - seems to me like a kid thing. My bet is on Burke and the other kids who were in the house that Christmas Day.

I don't believe Burke was ever asked about that pineapple - and years later, how would he ever remember?