I haven't checked in-game, but I am assuming the packing station shows up in the buildmode -> gardening section, because under the RAW data tab for Part 1, next to the catalog sort, it's set to Build mode type 4, and Buildmode subsort 10, which is the Gardening section:
http://simswiki.info/wiki.php?title=OBJD#Build_mode_type_and_subsort (if you, like me, have had many a rogue bush or tree annoyingly sorted under decorative plants, this, and many other things can be fixed by changing the type and subsort. Also pricing can be fixed in the RAW data tab)
I believe you need to have the advanced settings in SimPe enabled to see/access the RAW data tab.
As for cloning, what part of cloning is it that you need help with?
Do you just want to replace the mesh and texture, or do you want to make a packing station of your own with different things to be packed?
The first requires no cloning at all, while the second requires you to do some BHAV modding, of which the Part 1 packing station file have 96