The official primary source is section 44 IO in the Austrian Legal Information System. Subsection 1 refers separation rights over assets not belonging wholly or partly to the debtor to the general legal principles. Subsection 2 addresses a sale after opening and subsection 3 certain reimbursable expenses.
For communication with the insolvency administrator, compile the case reference, contract, applicable terms, order documents, delivery notes, invoices, payments, product markings, location evidence and details of any processing or resale.
Do not remove the goods unilaterally. Describe the asserted ownership position, specific asset and evidence precisely so that the estate can review the matter.