Indeed, without a known, solid provenance, compositional and/or metallurgical analysis is the only way to be reasonably sure, I'm afraid.
Other than that, to know a bit more on these, you may be interested in this work, published very recently:
VILAÇA, Raquel: "Depósitos de Bronze do Território Português: um debate em aberto", Conimbriga, Anexos 5, Instituto de Arqueologia da Facultade de Letras da Universidade de Coimbra (FLUC), 2007. ISBN: 978-972-9004-22-3
Again, a nice find.
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