Around 150 refugees were said to have been on the boat and 69 were found drifting at sea off Aceh province on Thursday.
They had spent more than a day standing on the hull of a capsized boat, while six others had been rescued by fishermen a day earlier.
“There is no additional information that we received about missing persons, and there is no manifest of the boat,” said Rachman.
“Our analysis is the boat cannot hold 150 people.”
But some earlier survivor accounts indicated many more people were swept away, according to local fishermen and officials.
West Aceh fishing community secretary-general Pawang Amiruddin told AFP by phone on Wednesday that survivors estimated there were “around 150 people on the boat”.
The United Nations High Commissioner for Refugees (UNHCR) also said it was “deeply concerned” about the incident.
A protection associate for the agency, Faisal Rahman, told AFP on Thursday that one of the survivors said “the boat took 151 people – once the boat capsized, approximately around 50 people (were) maybe missing and passed away”.
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