I used the original box, Styrofoam and wrapping material. I placed the glass in the box and the display unit was wrapped in the same material that the Imac came wrapped in. This was then also placed in the box (flipped over the Styrofoam so cut-outs faced up).
When re-assembling, after display was screwed back in and before I closed the glass - I cleaned all surfaces with a NEW microfiber cloth.
This web link has a video that I followed. It also shows the tool-kit (including suction cups) you will need. One change from the video that I learned from some user comments was when using cables to help center the logic board - don't use an Ethernet cable as the tab can get stuck behind the case. I used an ethernet cable but I broke off the tab to insure it would not get stuck