The fire burning at the Vale Business Park in Llandow is now out.
It began on November 26. A spokesperson for South Wales Fire & Rescue Service says efforts to tackle the blaze were hampered by the construction of the building - a former aircraft hangar built to withstand bombardment.
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The last confirmed sighting of the 14-year-old was in Flint on Friday morning.
After a mostly dry evening with a few scattered showers, cloud and outbreaks of showery rain will spread northeast through the night.
Tributes have been paid to former Wales international Mel Charles, who has died at the age of 81.