It does not appear to be mentioned but ethically I think you need to ask your clients if they in fact were infringing copyright. If so then you need to negotiate a fair settlement. Every one here seems to assume they are guilty and are trying to make a legal excuse or loophole for them to get off on a technicality. If they did the crime they need to suffer the consequences. All of that aside. Lets assume they are innocent.
Who had access to the computers that may have shared the files. Are there any malware type programs on the system that would allow remote access and the subsequent infringement was caused by an outsider. Lastly is there publicly available access to the home network. That is where you need to attack the problem. If your clients have evidence on their computers that could prove their innocence then by all means turn it over. The RIAA's experts may be more experienced than yours at tracking down the real offenders any ways.
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It does not appear to be mentioned but ethically I think you need to ask your clients if they in fact were infringing copyright. If so then you need to negotiate a fair settlement. Every one here seems to assume they are guilty and are trying to make a legal excuse or loophole for them to get off on a technicality. If they did the crime they need to suffer the consequences. All of that aside. Lets assume they are innocent. Who had access to the computers that may have shared the files. Are there any malware type programs on the system that would allow remote access and the subsequent infringement was caused by an outsider. Lastly is there publicly available access to the home network. That is where you need to attack the problem. If your clients have evidence on their computers that could prove their innocence then by all means turn it over. The RIAA's experts may be more experienced than yours at tracking down the real offenders any ways.