that said 'merry Xmas, love Lucy" ? was it max because he said to Stacey that he sent the turkey?

Max..

I assumed Max sent the pud to Ian and the crackers to the Mitchells. Since we was going to the trouble of getting a gift wrapped turkey for Stace anyway...

why did he put Lucy's name on it tho?

Revenge

To taunt Ian. Should have sent him a box set of I Love Lucy.

They kind of framed him for Lucy's murder, so I'm guessing as a bit of revenge to attempt to ruin their Christmas? Basically a sick joke kind of thing. :P