I am running VMware 8.5.8 Pro on the same macOS Sierra 10.12.5 host.
In VMware, I have a running OS X 10.6.3 guest. I did a successful Export of OVF...
In VirtualBox, Import Appliance fails. While the popup shows:
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Importing virtual disk image 'SnowLeop-disk1.vmdk' ... (2/3)
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Failed to import appliance /Volumes/Disk1/SnowLeop.ovf.
Could not create the imported medium '/Users/dev/VirtualBox VMs/vm/SnowLeop-disk1.vmdk' (VERR_VD_VMDK_INVALID_FORMAT).
Result Code: VBOX_E_FILE_ERROR (0x80BB0004)
Component: ApplianceWrap
Interface: IAppliance {8398f026-4add-4474-5bc3-2f9f2140b23e}