It is certainly possible to convert virtual machines from VirtualBox (.vbox) to other exchange formats, including Open Virtualization Format packages (.ovf), which is what vbox to ovf conversion pretty much is. However, in order to do so, you will need whole virtual machines, not just some files and you will get multiple output files, each for individual purposes.
Open VBOX file Open OVF fileFree system virtualization platform for Linux operating system developed by Oracle