They closed with a one-under-par 71 to tie for 20th alongside France in the 28-nation two-man teams event at Mission Hills in Shenzhen.
Smail and Lee signed for a tournament card of 12-under 276, picking up nine shots on the opening two days before fading at the weekend.
They began yesterday's third round in a share of seventh place but faded from contention with a 70 while many of their rivals went deep into red figures.
Pacesetters Ireland had lost the outright lead midway through the back nine today, with Italy assuming the lead on 29-under with five holes to play, one ahead of Sweden and two in front of the Irish.
