I saw this was an issue in an earlier thread where several state that the trunk can not be closed with the remote.
FYI The tailgate definitely closes with the remote , in europe at least.. Just keep pressing the trunk open button on the remote.. You have to hold it pressed all the way until it closes... When you release the button the closing mechanism stops, only the last few cm are automated without the need of button activation.
There's some latency before the mechanism is activated from the time of the moment you push the button, maybe it was this that tricked others..